1/2 oz Lemon Juice
1/4 oz White Crème de Cacao (Marie Brizard)
1/4 oz Simple Syrup
1 Egg White
Shake once without ice and once with ice. Strain into a tall glass pre-rinsed with orange blossom water and containing 1 1/2 oz soda water. (Recipe says to fill with ice, but omitted since Fizzes unlike Collins lack ice). Garnish with grated nutmeg and add a straw.
After the Grand Slam, I turned to Beachbum Berry's Remixed and spotted the Mariposa Fizz. The drink was served on Matson Line's S.S. Mariposa on its 42 day long South Seas cruise in 1962. The recipe caught my eye for it appeared like a Silver Fizz variation on the Mady from the 1937 Cafe Royal Cocktail Book.